diff --git a/demo/moulinrouge/tests.py b/demo/moulinrouge/tests.py
index 1d7efb3..0601400 100644
--- a/demo/moulinrouge/tests.py
+++ b/demo/moulinrouge/tests.py
@@ -50,7 +50,7 @@ def get_test_routes(app):
     def test_bar_links():
         bar = StackedLine(style=styles['default'](
             font_family='googlefont:Raleway'))
-        bar.js = ('http://l:2343/2.0.x/pygal-tooltips.js',)
+        # bar.js = ('http://l:2343/2.0.x/pygal-tooltips.js',)
         bar.title = 'Wow ! Such Chart !'
         bar.x_title = 'Many x labels'
         bar.y_title = 'Much y labels'
@@ -142,6 +142,7 @@ def get_test_routes(app):
     def test_bar_none():
         bar = Bar()
         bar.add('Lol', [2, None, 12])
+        bar.x_labels = range(1, 4)
         return bar.render_response()
 
     @app.route('/test/print_values')
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 623aaf5..7884c04 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -6,6 +6,7 @@ Changelog
 ================
 
 * Fix the missing title on x_labels with labels.
+* Auto cast to str x labels in non dual charts (#178)
 
 2.0.0
 =====
diff --git a/pygal/graph/funnel.py b/pygal/graph/funnel.py
index 82f4074..f76c1fa 100644
--- a/pygal/graph/funnel.py
+++ b/pygal/graph/funnel.py
@@ -23,6 +23,7 @@ from __future__ import division
 from pygal.adapters import none_to_zero, positive
 from pygal.graph.graph import Graph
 from pygal.util import alter, cut, decorate
+from pygal._compat import to_str
 
 
 class Funnel(Graph):
@@ -93,7 +94,8 @@ class Funnel(Graph):
 
     def _compute_x_labels(self):
         self._x_labels = list(
-            zip(self.x_labels or [
+            zip(self.x_labels and
+                map(to_str, self.x_labels) or [
                 serie.title['title']
                 if isinstance(serie.title, dict)
                 else serie.title for serie in self.series],
diff --git a/pygal/graph/graph.py b/pygal/graph/graph.py
index a8ba5e5..e786bb1 100644
--- a/pygal/graph/graph.py
+++ b/pygal/graph/graph.py
@@ -735,7 +735,7 @@ class Graph(PublicApi):
 
     def _compute_x_labels(self):
         self._x_labels = self.x_labels and list(
-            zip(self.x_labels, self._x_pos))
+            zip(map(to_str, self.x_labels), self._x_pos))
 
     def _compute_y_labels(self):
         y_pos = compute_scale(